But hydraulic (液压的) fracturing can also produce debate and anger over the risk of groundwater pollution. This

　　method of drilling is not federally supervised under the Safe Drinking Water Act. Some in Congress want to end that exemption (豁免) from the law.

　　Natural gas provides Americans with about one fourth of their energy. And, unlike oil, most of it is produced in America. Gas producers invested heavily in reaching new supplies when prices were high. But prices are down sharply now because the depression cut demand for energy. So energy expert Eric Potter says it is too early to know how the changing market prices will affect the market for gas shale exploration.

　　1. We can learn from the first paragraph that ______.

　　A. natural gas releases methane and carbon dioxide

　　B. natural gas is considered as the cleanest energy

　　C. natural gas is more environmentally friendly than other fossil fuels

　　D. natural gas is a renewable source of energy

　　答案及解析：

　　1．C。从It produces half the carbon dioxide of other fossil fuels. So it may help cut the production of carbon gases linked to climate change.可知 天然气燃烧产生的二氧化碳气体只是燃烧其他矿物燃料的一半，所以是环保的。

　　2. The word “fracture” in paragraph 3 probably means ______.

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